鼠标拖动移动三维物体

参考网址

PS:脚本挂在主摄像机上，对物体增加碰撞检测盒便可实现。
防止原网址删掉，复制一份（以下内容均为引用第一行网址内容，版权归原作者所有。）

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class ModelDrage : MonoBehaviour
{
    private Camera cam;//发射射线的摄像机
    private GameObject go;//射线碰撞的物体
    public static string btnName;//射线碰撞物体的名字
    private Vector3 screenSpace;
    private Vector3 offset;
    private bool isDrage = false;
    void Start()
    {
        cam = Camera.main;
    }
    void Update()
    {
        //整体初始位置 
        Ray ray = cam.ScreenPointToRay(Input.mousePosition);
        //从摄像机发出到点击坐标的射线
        RaycastHit hitInfo;
        if(isDrage ==false)
        {
            if (Physics.Raycast(ray, out hitInfo))
            {
                //划出射线，只有在scene视图中才能看到
                Debug.DrawLine(ray.origin, hitInfo.point);
                go = hitInfo.collider.gameObject;
                //print(btnName);
                screenSpace = cam.WorldToScreenPoint(go.transform.position);
                offset = go.transform.position - cam.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenSpace.z));
                //物体的名字  
                btnName = go.name;
                //组件的名字
            }
            else
            {
                btnName = null;
            }
        }
        if (Input.GetMouseButton(0))
        {
            Vector3 currentScreenSpace = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenSpace.z);
            Vector3 currentPosition = cam.ScreenToWorldPoint(currentScreenSpace) + offset;
            if(btnName !=null)
            {
                go.transform.position = currentPosition;
            }
            
            isDrage = true;
        }
        else
        {
            isDrage = false;
        }
    }
}
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版权声明：本文为优快云博主「南极冰魄」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/weixin_41071087/article/details/79237849